Which of the above properties of a system is/are extensive?

Question

Consider the following properties:

I. Entropy                     

2. Viscosity

3. Temperature

4. Specific heat at constant volume

Which of the above properties of a system is/are extensive?

(a) 1 only                     (b) 1 and 2 only

(c) 2, 3 and 4               (d) I, 2 and 4